CN111184937A - Intelligent automatic control oxygen supply device and intelligent automatic control oxygen supply method - Google Patents
Intelligent automatic control oxygen supply device and intelligent automatic control oxygen supply method Download PDFInfo
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- CN111184937A CN111184937A CN202010185177.9A CN202010185177A CN111184937A CN 111184937 A CN111184937 A CN 111184937A CN 202010185177 A CN202010185177 A CN 202010185177A CN 111184937 A CN111184937 A CN 111184937A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 239000001301 oxygen Substances 0.000 title claims abstract description 94
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 230000001681 protective effect Effects 0.000 claims description 20
- 238000013459 approach Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 abstract description 9
- 239000008280 blood Substances 0.000 description 14
- 210000004369 blood Anatomy 0.000 description 13
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3334—Measuring or controlling the flow rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2230/00—Measuring parameters of the user
- A61M2230/20—Blood composition characteristics
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- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Pulmonology (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measuring Volume Flow (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention belongs to the technical field of automatic control, and discloses an intelligent automatic control oxygen supply device, wherein the intelligent automatic control oxygen supply device comprises a wireless communication device and a control device. The wireless communication device receives a regulating signal from the electronic device; the control device adjusts the flow rate knob of the float flowmeter according to the adjusting signal, thereby controlling oxygen supply. The embodiment of the invention also provides an intelligent automatic control oxygen supply method. The intelligent automatic control oxygen supply device and the intelligent automatic control oxygen supply method provided by the embodiment of the invention can reduce the labor cost and realize the automation of oxygen supply.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to an intelligent automatic control oxygen supply device and an intelligent automatic control oxygen supply method.
Background
With the development of science and technology and civilization, human life gradually becomes more convenient and safer, and the quality of life also continuously improves. For example, the development of science and technology, oxygen supply systems in emergency treatment and therapy in hospitals are also developing in a direction of being more convenient and safer.
However, most hospitals use oxygen supply systems that are operated by nurses who will regularly monitor the blood oxygen concentration of patients and adjust the oxygen flow rate of the oxygen supply system. This method requires much medical labor and cost, and most of the available electronic flow control valves are expensive.
Disclosure of Invention
The invention aims to provide an intelligent automatic control oxygen supply device and an intelligent automatic control oxygen supply method, which solve the problems in the prior art.
In an embodiment of the present invention, the intelligent automatic control oxygen supply apparatus provided by the present invention includes a wireless communication device and a control device. The wireless communication device receives a regulating signal from the electronic device; the control device adjusts the flow rate knob of the float flowmeter according to the adjusting signal, thereby controlling oxygen supply.
In an embodiment of the present invention, the float flow meter includes a tube and a float, one end of the tube is an air inlet, the other end of the tube is closed, the air inlet is adjacent to the flow rate knob, the intelligent automatic control oxygen supply device further includes a sensor, the sensor is disposed around the tube and adjacent to the air inlet, when the sensor senses that the float is close to the air inlet, the control device determines that the oxygen supply is insufficient, and the control device transmits a warning notification to the electronic device through the wireless communication device.
In an embodiment of the present invention, the control device includes a motor, a gear, an external knob gear, a motor driver and a processor. The gear entity is connected with the motor, the external knob gear is sleeved on the flow speed knob and meshed with the gear, the motor driver is electrically connected with the motor, and the processor is electrically connected with the motor driver. The processor enables the motor driver to drive the motor to operate according to the adjusting signal, so that the motor drives the gear, and further drives the external knob gear to adjust so as to adjust the flow rate knob.
In an embodiment of the present invention, the intelligent automatic control oxygen supply apparatus further includes a cover opening detector. The cover opening detector detects whether the external knob gear is shielded by the protective cover, and when the external knob gear is shielded by the protective cover, the processor judges that the external knob gear is in an automatic mode. In the automatic mode, the processor drives the motor to operate according to the adjustment signal.
In an embodiment of the invention, when the external knob gear is not shielded by the protective cover, the processor determines the manual mode, and in the manual mode, the processor stops the motor.
In an embodiment of the present invention, the method includes the following steps: receiving a regulating signal from the electronic device; according to the adjusting signal, the flow rate knob of the float flowmeter is adjusted, thereby controlling the oxygen supply.
In one embodiment of the present invention, the float flowmeter has a tube and a float, wherein one end of the tube is an air inlet and the other end is closed, the air inlet is adjacent to the flow rate knob, and the sensor ring is disposed on the periphery of the tube and adjacent to the air inlet. The intelligent automatic control oxygen supply method further comprises the following steps: when the sensor senses that the float approaches the air intake port, it is determined that the oxygen supply is insufficient, and a warning notification is transmitted to the electronic device.
In an embodiment of the present invention, the method for intelligently and automatically controlling oxygen supply further includes: according to the adjusting signal, the motor is driven to operate, so that the motor drives the gear, and the flow rate knob is adjusted through the external knob gear meshed with the gear, wherein the external knob gear is sleeved on the flow rate knob, and the gear is physically connected with the motor.
In an embodiment of the present invention, the method for intelligently and automatically controlling oxygen supply further includes: detecting whether the external knob gear is shielded by the protective cover; when the external knob gear is shielded by the protective cover, the automatic mode is determined; in the automatic mode, the motor is driven to operate according to the adjustment signal.
In an embodiment of the present invention, the method for intelligently and automatically controlling oxygen supply further includes: when the external knob gear is not shielded by the protective cover, the manual mode is determined; in the manual mode, the motor is stopped.
In conclusion, compared with the prior art, the technical scheme of the invention has obvious advantages and beneficial effects. The intelligent automatic control oxygen supply device can be assembled by matching with the existing hospital equipment, and the intelligent automatic control oxygen supply method can also be implemented by matching with the existing hospital equipment, so that the oxygen supply flow rate can be automatically and dynamically adjusted by monitoring the blood oxygen condition of a patient, the device and labor cost can be greatly reduced, and an alarm signal is provided to inform a nurse to improve the safety in an emergency.
The above description will be described in detail by embodiments, and further explanation will be provided for the technical solution of the present invention.
Drawings
One or more embodiments are illustrated by the corresponding figures in the drawings, which are not meant to be limiting.
Fig. 1 is a block diagram of an intelligent automatic control oxygen supply apparatus according to an embodiment of the present invention;
FIG. 2 is a partial exploded perspective view of a float flow meter according to an embodiment of the invention;
FIG. 3 is a partial exploded perspective view of a float flow meter according to another embodiment of the invention;
FIG. 4 is a flow chart of a method for intelligently and automatically controlling oxygen supply according to an embodiment of the present invention;
reference numerals: 100-intelligent automatic control oxygen supply device, 110-wireless communication device, 120-control device, 121-motor, 122-gear, 123-external knob gear, 124-motor driver, 125-processor, 130-sensor, 140-cover detector, 150-battery, 152-power supply/charging system, 153-port, 190-electronic device, 195-blood oxygen measuring device, 200-float flowmeter, 201-flow rate knob, 202-tube, 203-float, 205-protective cover, 206-shell, 207-air inlet, 310-socket.
Detailed Description
In order to make the description of the present invention more complete and complete, reference is made to the accompanying drawings and the various embodiments described below, in which like reference numerals refer to the same or similar elements. In other instances, well-known elements and steps have not been described in detail in order to avoid unnecessarily obscuring the present invention.
In the description of the embodiments and claims, reference to "connected" may refer broadly to a component being indirectly coupled to another component through another component or a component being directly linked to another component without the need for the other component.
In embodiments and claims, references to "connected" may generally refer to a component being in wired and/or wireless communication, indirectly, with another component via another component or a component being physically connected to another component without the need for the other component.
In the description and claims, the terms "a" and "an" can be used broadly to refer to a single or to a plurality of elements, unless the context specifically states the article.
As used herein, "about" or "approximately" is intended to modify the quantity by which any slight variation is made, but such slight variation does not alter the nature thereof. Unless otherwise specified, the range of error for values modified by "about", "about" or "approximately" is generally tolerated within twenty percent, preferably within ten percent, and more preferably within five percent.
Fig. 1 is a block diagram of an intelligent automatic control oxygen supply apparatus 100 according to an embodiment of the present invention. As shown in fig. 1, the intelligent automatic control oxygen supply device at least comprises a wireless communication device 110 (e.g., a wireless transceiver) and a control device 120. In terms of configuration, the control device 120 is electrically connected to the wireless communication device 110, the wireless communication device 110 establishes wireless communication with the electronic device 190 (e.g., a mobile phone, a tablet …, etc.), and the electronic device 190 establishes wireless communication with the blood oxygen measuring device 195 (e.g., a blood oxygen meter, a finger blood oxygen monitor …, etc.).
When in use, the blood oxygen measuring device 195 provides the blood oxygen value to the electronic device 190 through wireless transmission, and the electronic device 190 determines the blood oxygen condition to generate the adjustment signal. The wireless communication device 110 receives the adjustment signal from the electronic device 190, and the control device 120 adjusts the flow rate knob 201 of the float flowmeter 200 according to the adjustment signal, thereby controlling the supply of oxygen. Therefore, the intelligent automatic control oxygen supply device 100 can intelligently and automatically control the oxygen flow rate of the oxygen supply system.
To further illustrate the float flowmeter 200, please refer to fig. 1-3, fig. 2 is a partially exploded perspective view of the float flowmeter 200 according to an embodiment of the present invention, and fig. 3 is a partially exploded perspective view of the float flowmeter 200 according to another embodiment of the present invention. In comparison to fig. 2, fig. 3 omits the sensor 130, the protective cover 205, and the housing 206. In addition, the external knob gear 123 and the flow rate knob 201 are exploded in fig. 2, only the form of the flow rate knob 201 is shown; after actual assembly, as shown in fig. 3, the external knob gear 123 is sleeved on the flow rate knob 201.
In fig. 2, the float flow meter 200 has a tube 202 and a float 203, wherein one end of the tube 202 is an air inlet 207 and the other end is closed, the air inlet 207 is adjacent to the flow rate knob 201, and the sensor 130 (e.g., an optical sensor, a hall sensor …, etc.) is disposed around the outer periphery of the tube 202 and adjacent to the air inlet 207. In fig. 1, the sensor 130 is electrically connected to the control device 120. When the sensor 130 senses that the float 203 is approaching the air inlet 207, the control device 120 determines that the oxygen supply is insufficient (e.g., no oxygen supply, low oxygen supply …, etc.), and the control device 120 transmits a warning notification to the electronic device 190 via the wireless communication device 110.
As shown in fig. 1, the control device 120 includes a motor 121 (e.g., a stepping motor), a gear 122, an external knob gear 123, a motor driver 124, and a processor 125. In fig. 1, the motor driver 124 is electrically connected to the motor 125, and the processor 125 is electrically connected to the motor driver 124. In fig. 3, a gear 122 is physically connected to the motor 121, and an external knob gear 123 is engaged with the gear 122. In addition, the external knob gear 123 is sleeved on the flow rate knob 201, as shown in fig. 3.
When the flow rate adjusting device is in use, the processor 125 enables the motor driver 124 to drive the motor 121 to operate according to the adjusting signal, so that the motor 121 drives the gear 122, and further drives the external knob gear 123 to adjust so as to adjust the flow rate knob 201. According to the invention, the rotation angle of the flow rate knob 201 is controlled by the motor 121 to be calibrated with the flow rate of the float flowmeter 200, so that the size of the valve is controlled to achieve oxygen flow rate control, and the flow rate is not required to be manually interpreted.
In fig. 1, the cover detector 140 (e.g., optical sensor, hall sensor, contact connection switch …, etc.) is electrically connected to the control device 120. In practice, the cap-open detector 140 may be disposed on the protection cap 205, the external knob gear 123 and/or the flow rate knob 201 as shown in fig. 2. The cover detector 140 detects whether the external knob gear 123 is covered by the protective cover 205, and the processor 125 determines the automatic mode when the external knob gear 123 is covered by the protective cover 205. It should be understood that the external knob gear 123 and the flow rate knob 201 are exploded in fig. 2, and only the flow rate knob 201 is shown; after the actual assembly, the external knob gear 123 is sleeved on the flow rate knob 201, so that the external knob gear 123 is shielded by the protective cover 205.
In the automatic mode, the processor 125 makes the motor driver 124 drive the motor 121 to operate according to the adjustment signal, so that the motor 121 drives the gear 122, and further drives the external knob gear 123 to adjust the flow rate knob 201. Thereby, the external knob gear 123 improves automatic mode test safety in the protective cover 205.
Alternatively, when the external knob gear 123 is not shielded by the protective cover 205, the processor 125 determines the manual mode. In the manual mode, the processor deactivates the motor 121. Therefore, the nurse can manually adjust the oxygen supply flow rate of the patient according to the condition of the patient.
In fig. 1, the intelligent automatic control oxygen supply apparatus 100 may include a battery 150, a power supply/charging system 152 (e.g., a charging/discharging circuit), and a port 153. In terms of configuration, the wireless communication device 110, the control device 120, the sensor 130 and the cover detector 140 are electrically connected to the battery 150, the battery 150 is electrically connected to the power supply/charging system 152, and the power supply/charging system 152 is electrically connected to the port 153. In use, the port 153 may be electrically connected to the receptacle 310 as shown in fig. 3 to enable the power/charging system 152 to charge the battery 150. In practice, if the power of the battery 150 is lower than the default threshold, the control device 120 sends an alarm notification to the electronic device 190 through the wireless communication device 110, so as to remind the nurse.
In summary, the intelligent automatic control oxygen supply device 100 has the following features. The rotation angle of the flow rate knob 201 is controlled by the motor 121 to be calibrated with the flow rate of the matched float flowmeter 200, so that the size of the control valve is controlled to achieve oxygen flow rate control, and the flow rate is not required to be manually interpreted. The wireless communication device 110 establishes wireless communication with the electronic device 190 to monitor and control the condition of the patient in real time, and the control device 120 adjusts the flow rate of oxygen supply for the patient. The intelligent automatic control oxygen supply apparatus 100 can detect an alarm when no (low) oxygen is supplied. The invention can also feed back the emergency condition of the user in time, and the alarm of the low blood oxygen with the highest flow rate can be used for emergency alarm. The intelligent automatic control oxygen supply device 100 can be used automatically and manually, the external knob gear 123 in the protective cover 205 improves the safety of automatic mode testing, and can also actively detect on and off to judge manual mode switching. Through the intelligent automatic control oxygen supply device 100, the oxygen supply gas cylinder (short time) and the oxygen supply system (long time) can be used, and in addition, the medical labor cost can be reduced.
To further explain the operation of the above-mentioned intelligent automatic oxygen supply control apparatus 100, please refer to fig. 1 to 4, and fig. 4 is a flowchart of an intelligent automatic oxygen supply control method 400 according to an embodiment of the present invention. As shown in fig. 4, the intelligent automatic oxygen supply control method 400 includes steps S401 to S406 (it should be understood that the steps mentioned in this embodiment, except for the specific sequence, can be performed simultaneously or partially simultaneously, with the sequence being adjusted according to actual needs).
The blood oxygen measuring device 195 provides the blood oxygen value to the electronic device 190 through wireless transmission, and the electronic device 190 determines the blood oxygen condition to generate the adjustment signal. In step S401, the adjustment signal from the electronic device 190 is received.
In step S402, it is determined whether or not the mode is the manual mode. Specifically, in step S402, it is detected whether the external knob gear 123 is shielded by the protection cover 205. When the external knob gear 123 is shielded by the protective cover 205, the automatic mode is determined; on the contrary, when the external knob gear 123 is not shielded by the protective cover 205, it is determined as the manual mode.
In step S403, the flow rate knob 201 of the float flowmeter 200 is adjusted according to the adjustment signal, thereby controlling the supply of oxygen. Specifically, in step S403, in the automatic mode, the motor 121 is driven to operate according to the adjustment signal, so that the motor 121 drives the gear 122 to adjust the flow rate knob 201 through the external knob gear 123 engaged with the gear 122, wherein the external knob gear 123 is sleeved on the flow rate knob 201, and the gear 122 is physically connected to the motor 121.
In step S404, it is judged whether or not the oxygen supply is insufficient. In one embodiment of the present invention, the float flow meter 200 has a tube 202 and a float 203, the tube has an inlet 207 at one end and a closed end, the inlet is adjacent to the flow rate knob 201, and the sensor 130 is disposed around the tube 202 and adjacent to the inlet 207. When the sensor senses that the float 203 approaches the air inlet 207, it is determined that the oxygen supply is insufficient, and in step S405, a warning notification is transmitted to the electronic device 190.
On the other hand, in step S406, the motor 121 is stopped in the manual mode. Therefore, the nurse can manually adjust the oxygen supply flow rate of the patient according to the condition of the patient.
In conclusion, compared with the prior art, the technical scheme of the invention has obvious advantages and beneficial effects. The intelligent automatic oxygen supply control device 100 of the present invention can be assembled by using the existing hospital equipment, and the intelligent automatic oxygen supply control method 400 of the present invention can also be implemented by matching with the existing hospital equipment, so that the device and labor cost can be greatly reduced by automatically and dynamically adjusting the oxygen supply flow rate through monitoring the blood oxygen condition of the patient, and an alarm signal is provided to inform the nurse to improve the safety in case of emergency.
Although the present invention has been described with reference to particular embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides an intelligence automatic control apparatus of oxygen suppliment which characterized in that contains:
a wireless communication device for receiving a regulating signal from an electronic device; and
and the control device adjusts a flow rate knob of a float flowmeter according to the adjusting signal so as to control oxygen supply.
2. The apparatus of claim 1, wherein the float flowmeter comprises a tube and a float, the tube has an inlet at one end and a closed end, the inlet is adjacent to the flow rate knob, the apparatus further comprises:
and the sensor is arranged around the periphery of the pipe body and is adjacent to the air inlet, when the sensor senses that the floater approaches the air inlet, the control device judges that oxygen supply is insufficient, and the control device transmits a warning notice to the electronic device through the wireless communication device.
3. The intelligent automatic control oxygen supply device according to claim 1, wherein the control device comprises:
a motor;
a gear physically connected to the motor;
the external knob gear is sleeved on the flow rate knob and is meshed with the gear; and
the motor driver is electrically connected with the motor;
and the processor is electrically connected with the motor driver, and the processor enables the motor driver to drive the motor to run according to the adjusting signal, so that the motor drives the gear, and further drives the external knob gear to adjust so as to adjust the flow rate knob.
4. The intelligent automatic control oxygen supply device according to claim 3, further comprising:
and the cover opening detector detects whether the external knob gear is shielded by a protective cover, when the external knob gear is shielded by the protective cover, the processor judges that the external knob gear is in an automatic mode, and in the automatic mode, the processor enables the motor driver to drive the motor to operate according to the adjusting signal.
5. The apparatus according to claim 4, wherein the processor determines a manual mode when the external knob gear is not covered by the protection cover, and the processor stops the motor in the manual mode.
6. An intelligent automatic control oxygen supply method is characterized by comprising the following steps:
receiving a regulating signal from an electronic device; and
and adjusting a flow rate knob of a float flowmeter according to the adjusting signal so as to control oxygen supply.
7. The intelligent automatic oxygen supply control method according to claim 6, wherein the float flowmeter comprises a tube and a float, the tube has an inlet at one end and a closed end, the inlet is adjacent to the flow rate knob, a sensor is disposed around the tube and adjacent to the inlet, and the intelligent automatic oxygen supply control method further comprises:
when the sensor senses that the float is close to the air inlet, it is determined that the oxygen supply is insufficient, and a warning notice is transmitted to the electronic device.
8. The intelligent automatic oxygen supply control method according to claim 6, further comprising:
and driving a motor to operate according to the adjusting signal, so that the motor drives a gear to further drive an external knob gear meshed with the gear to adjust the flow rate knob, wherein the external knob gear is sleeved on the flow rate knob, and the gear is physically connected with the motor.
9. The intelligent automatic oxygen supply control method according to claim 8, further comprising:
detecting whether the external knob gear is shielded by a protective cover;
when the external knob gear is shielded by the protective cover, the external knob gear is judged to be in an automatic mode; and
and in the automatic mode, driving the motor to operate according to the adjusting signal.
10. The intelligent automatic oxygen supply control method according to claim 9, further comprising:
when the external knob gear is not shielded by the protective cover, the external knob gear is judged to be in a manual mode; and
in the manual mode, the motor is stopped.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185177.9A CN111184937B (en) | 2020-03-17 | 2020-03-17 | Intelligent automatic control oxygen supply device and intelligent automatic control oxygen supply method |
| TW109114701A TWI725838B (en) | 2020-03-17 | 2020-05-01 | Intelligent automatic control oxygen supply device and intelligent automatic control oxygen supply method |
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| CN202010185177.9A CN111184937B (en) | 2020-03-17 | 2020-03-17 | Intelligent automatic control oxygen supply device and intelligent automatic control oxygen supply method |
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| CN111184937A true CN111184937A (en) | 2020-05-22 |
| CN111184937B CN111184937B (en) | 2022-09-23 |
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| TW (1) | TWI725838B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111184937B (en) | 2022-09-23 |
| TW202135728A (en) | 2021-10-01 |
| TWI725838B (en) | 2021-04-21 |
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